package com.sky.service.impl;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.enumeration.OperationType;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PostMapping;

import java.beans.beancontext.BeanContext;
import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .dishFlavor(shoppingCartDTO.getDishFlavor())
                .dishId(shoppingCartDTO.getDishId())
                .setmealId(shoppingCartDTO.getSetmealId())
                .userId(BaseContext.getCurrentId())
                .build();
        //判断当前加入到购物车中的商品是否已经存在了
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在了，只需要将数量加一
        if (list!=null && list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            //更新购物车数量
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在，需要插入一条购物车数指
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId!=null){
                //判断本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //判断本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前微信用户
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 根据用户Id清空购物数据
     */
    @Override
    public void deleteAll() {
        //获取当前用户id
        Long userId = BaseContext.getCurrentId();
        //根据用户Id清空购物数据
        shoppingCartMapper.deleteByUserId(userId);
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void delete(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .dishFlavor(shoppingCartDTO.getDishFlavor())
                .dishId(shoppingCartDTO.getDishId())
                .setmealId(shoppingCartDTO.getSetmealId())
                .userId(BaseContext.getCurrentId())
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //获取购物车中当前商品的数量
        ShoppingCart shopping = list.get(0);
        int number = shopping.getNumber();
        if(number>1){
            //如果数量大于1 bumber--
            number= number - 1;
            shopping.setNumber(number);
            shoppingCartMapper.updateNumberById(shopping);
        }else {
            //如果数量等于于1  就删除该商品
            log.info("购物车中当前商品:{}",list);
            shoppingCartMapper.delete(shoppingCart);
        }
    }
}
